[PATCH 3/4] ARM: shmobile: move r8a7740 DMA controller DT node under a "dma-mux" node

On r8a7740 multiple DMA controllers can serve the same slaves with the same DMA slave IDs. To use this feature DMA controller DT nodes have to be grouped under "dma-mux" multiplexer nodes and slaves have to be modified to reference multiplexer nodes instead of individual DMA DT nodes. Future

[PATCH 3/4] ARM: shmobile: move r8a7740 DMA controller DT node under a dma-mux node

On r8a7740 multiple DMA controllers can serve the same slaves with the same DMA slave IDs. To use this feature DMA controller DT nodes have to be grouped under dma-mux multiplexer nodes and slaves have to be modified to reference multiplexer nodes instead of individual DMA DT nodes. Future patches